Introduction to GIS. Geol 4048 Geological Applications of Remote Sensing

Transcription

1 Introduction to GIS Geol 4048 Geological Applications of Remote Sensing

2 GIS History: Before Computers

3 GIS History Using maps for a long time

4 Dr. Roger F. Tomlinson Father of GIS He was an English geographer and the primary originator of modern computerized geographic information systems (GIS), and he has been acknowledged as the "father of GIS. He was born in 17 November 1933 and died in 9 February After his military service, Dr. Tomlinson attended the University of Nottingham and Acadia University for two separate undergraduate degrees in geography and geology, respectively. He received a Masters degree in geography from McGill University where he specialized in the glacial geomorphology of Labrador. His Doctoral thesis at University College London was titled: The application of electronic computing methods and techniques to the storage, compilation, and assessment of mapped data. Dr. Tomlinson's early career included serving as an assistant professor at Acadia, working as the manager of the computer mapping division at Spartan Air Services in Ottawa, Ontario (following his studies at McGill), and work with the Government of Canada first as a consultant and later as a director of regional planning systems with the Department of Forestry and Rural Development. It was during his tenure with the federal government in the 1960s that Dr. Tomlinson initiated, planned and directed the development of the Canada Geographic Information System, the first computerized GIS in the world.

5 What is GIS A geographic information system (GIS) lets us visualize, question, analyze, and interpret data to understand relationships, patterns, and trends.

6 What is GIS A GIS integrates hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographically referenced information. GIS allows us to establish relationships and patterns in the form of maps, reports, and charts. A GIS helps you answer questions and solve problems by looking at your data in a way that is quickly understood and easily shared. GIS technology can be integrated into any field.

7 GIS Components

8 The Basic Principle A GIS map contains layers

9 A layers that contains many of the same types of things, like coal basins, transmission lines, states, and lakes, is called a feature. Layers may contain features or surfaces A layer that is not a collection of geographic objects and is considered a single, continuous expanse that change from one location to another like bathymetry and elevation, is called a surface.

10 Geographic objects have an endless variety of shapes and can be represented as one of three geometric forms: Features have shape and size Polygons: objects that are large enough to have boundaries Countries, lakes, and tracks of land Lines: objects that are relatively too narrow to be polygons Rivers, roads, and pipelines Points: objects that are relatively too small to be polygons Cities, schools, fire hydrant These features are collectively called vector data.

11 Surfaces have numeric values rather than shapes Natural phenomena, such elevation, slope, temperature, rainfall, and wind speed, have no distinct shape. They have instead measurable values for any location on the Earth s surface. The most common kind of surface is a raster, a matrix of identically sized squared cells. Each cell represents a unit of surface area.

12 Vector vs. Raster Which is the best format?

13 Features have locations A graticule is a grid over the world map that indicates a certain number of marks up or down from and to the right or left of a given starting point. This kind of grid is called a coordinate system, and it is what a GIS uses to put features in their proper place on a map.

14 Features can be displayed at different sizes Scale, commonly expressed as a ratio, is the relationship between the size of the features on a map and the size of the corresponding places in the world.

15 Features are linked to information Attribute table

16 Features have spatial relationships

17 New features can be created from areas of overlap

18 New features can be created from areas of overlap

19 IDRISI MapInfo Examples of GIS Software GRASS GIS grass.osgeo.org/ QGIS ArcGIS

20 ArcGIS from ESRI

21 History of ESRI Jack and Laura Dangermond founded Environmental Systems Research Institute (ESRI) in 1969 as a small research group focused on land-use planning. The company's early mission was to organize and analyze geographic information to help land planners and land resource managers make well-informed environmental decisions.

22 History of ESRI 1982 Esri enters the software business with ARC/INFO.

23 History of ESRI 1986 Esri releases PC ARC/INFO in response to the proliferation of IBM PCs.

24 History of ESRI 1991 Esri releases ArcView in response to the popularity of a GUI desktop environment.

25 History of ESRI 2004 ArcGIS 9 builds on desktop success and adds a development framework and server platform.

26 History of ESRI 2012 ArcGIS 10.1 debuts, enabling users to deliver any GIS resource as a web service, putting geographic information in the hands of more people.

27 History of ESRI 2014

28 History of ESRI

29 ArcGIS Desktop ArcGIS Desktop ArcReader (Free) ArcView (Basic) ArcEditor (Standard) ArcInfo (Advanced) ArcMap ArcCatalog ArcGlobe ArcScene Spatial Analyst 3D Analyst Others

30 ArcMap

31 ArcCatalog

32 ArcToolbox

33 ArcGIS Mobile The increasing portability of GPS receivers has enable laptops, PDAs, and cellular phones to link precise, real-time, locational information to a GIS. o Enter new data as it directly observed o Verify or update information already in the system o Valuable for registering digital images or satellite imagery o Provides immediate on-site access to spatial data in the field

34 ArcGIS Server

35 Online GIS

36 Any question?